Image:Popular Electronics Frequency Counter.jpg

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[edit] Summary

This Universal Frequency Counter appeared in an article written by Don Lancaster in the March 1969 issue of Popular Electronics.[1]

The catalog was published by Southwest Technical Products Corporation in 1969 without a copyright notice. The company published over twenty company catalogs between 1968 and 1978 and none had a copyright notice. The privately held company ceased all operations around 1990.

This scan of a public domain catalog page is from my web site.[2]

[edit] Licensing

This work is in the public domain in the United States because it was first published in the United States without copyright notice prior to 1978, which causes the work to be irrevocably in the Public Domain. See Copyright.

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